usml

STS-73 was a Space Shuttle program mission, during October–November 1995. The mission was the second mission for the United States Microgravity Laboratory. The crew, who spent 16 days in space, were broken up into 2 teams, the red team and the blue team. The mission also included several Detailed Test Objectives or DTO's.
The second United States Microgravity Laboratory (USML-2) Spacelab mission was the prime payload on STS-73. The 16-day flight continued a cooperative effort of the U.S. government, universities and industry to push back the frontiers of science and technology in "microgravity", the near-weightless environment of space.
Some of the experiments carried on the USML-2 payload were suggested by the results of the first USML mission that flew aboard Columbia in 1992 during STS-50. The USML-1 mission provided new insights into theoretical models of fluid physics, the role of gravity in combustion and flame spreading, and how gravity affects the formation of semiconductor crystals. Data collected from several protein crystals grown on USML-1 enabled scientists to determine the molecular structures of those proteins.

Experiment on board United States Microgravity Laboratory USML-1 (STS-50) and USML-2 (STS-73) 

STS-50 (U.S. Microgravity Laboratory 1) was a United States Space Shuttle mission, the 12th mission of the Columbia orbiter. Columbia landed at Kennedy Space Center for the first time ever due to bad weather at Edwards caused by the remnants of Hurricane Darby.
The U.S. Microgravity Laboratory 1 was a spacelab mission, with experiments in material science, fluid physics and biotechnology. It was the first flight of a Space Shuttle with the Extended Duration Orbiter (EDO) hardware, allowing longer flight durations.
Primary payload, U.S. Microgravity Laboratory-1 (USML- 1), made its first flight; featured pressurized Spacelab module. USML-1 first in planned series of flights to advance U.S. microgravity research effort in several disciplines. Experiments conducted were: Crystal Growth Furnace (CGF); Drop Physics Module (DPM); Surface Tension Driven Convection Experiments (STDCE); Zeolite Crystal Growth (ZCG); Protein Crystal Growth (PCG); Glovebox Facility (GBX); Space Acceleration Measurement System (SAMS); Generic Bioprocessing Apparatus (GBA); Astroculture-1 (ASC); Extended Duration Orbiter Medical Project (EDOMP); Solid Surface Combustion Experiment (SSCE).
Secondary experiments were: Investigations into Polymer Membrane Processing (IPMP); Shuttle Amateur Radio Experiment II (SAREX II); and Ultraviolet Plume Instrument (UVPI).

Very similar to the A-B Emblem souvenir version.

STS-50 (U.S. Microgravity Laboratory 1) was a United States Space Shuttle mission, the 12th mission of the Columbia orbiter. Columbia landed at Kennedy Space Center for the first time ever due to bad weather at Edwards caused by the remnants of Hurricane Darby.
The U.S. Microgravity Laboratory 1 was a spacelab mission, with experiments in material science, fluid physics and biotechnology. It was the first flight of a Space Shuttle with the Extended Duration Orbiter (EDO) hardware, allowing longer flight durations.
Primary payload, U.S. Microgravity Laboratory-1 (USML- 1), made its first flight; featured pressurized Spacelab module. USML-1 first in planned series of flights to advance U.S. microgravity research effort in several disciplines. Experiments conducted were: Crystal Growth Furnace (CGF); Drop Physics Module (DPM); Surface Tension Driven Convection Experiments (STDCE); Zeolite Crystal Growth (ZCG); Protein Crystal Growth (PCG); Glovebox Facility (GBX); Space Acceleration Measurement System (SAMS); Generic Bioprocessing Apparatus (GBA); Astroculture-1 (ASC); Extended Duration Orbiter Medical Project (EDOMP); Solid Surface Combustion Experiment (SSCE).
Secondary experiments were: Investigations into Polymer Membrane Processing (IPMP); Shuttle Amateur Radio Experiment II (SAREX II); and Ultraviolet Plume Instrument (UVPI).

Unlike the A-B Emblem version, this patch has a blue border that is stiched all around the border. 

STS-50 (U.S. Microgravity Laboratory 1) was a United States Space Shuttle mission, the 12th mission of the Columbia orbiter. Columbia landed at Kennedy Space Center for the first time ever due to bad weather at Edwards caused by the remnants of Hurricane Darby.
The U.S. Microgravity Laboratory 1 was a spacelab mission, with experiments in material science, fluid physics and biotechnology. It was the first flight of a Space Shuttle with the Extended Duration Orbiter (EDO) hardware, allowing longer flight durations.
Primary payload, U.S. Microgravity Laboratory-1 (USML- 1), made its first flight; featured pressurized Spacelab module. USML-1 first in planned series of flights to advance U.S. microgravity research effort in several disciplines. Experiments conducted were: Crystal Growth Furnace (CGF); Drop Physics Module (DPM); Surface Tension Driven Convection Experiments (STDCE); Zeolite Crystal Growth (ZCG); Protein Crystal Growth (PCG); Glovebox Facility (GBX); Space Acceleration Measurement System (SAMS); Generic Bioprocessing Apparatus (GBA); Astroculture-1 (ASC); Extended Duration Orbiter Medical Project (EDOMP); Solid Surface Combustion Experiment (SSCE).
Secondary experiments were: Investigations into Polymer Membrane Processing (IPMP); Shuttle Amateur Radio Experiment II (SAREX II); and Ultraviolet Plume Instrument (UVPI).

The white backing of the STS-50 patch might be one of the most distinctive of all of A-B Emblem's shuttle patches.

To determine the structure, researchers must grow near-perfect crystals of the protein being studied. On Earth, convection currents, sedimentation, and other gravity-induced phenomena hamper crytal growth efforts. In microgravity, researchers can grow near-perfect crystals in an environment free of these effects. Because of the enormous potential for new pharmaceutical products, the Center for Macromolecular Crystallography -- the NASA Commercial Space Center responsible for commercial protein crystal growth efforts -- has more than 50 major industry and academic partners. Experiment on STS-95

The Colloidal Disorder-Order Transition (CDOT) experiment will test fundamental theories that model atomic interactions. CDOT is part of the Second United States Microgravity Laboratory (USML-2) that will fly aboard the Space Shuttle Columbia. STS-95

The Drop Physics Module has been developed so scientists can study several fluid physics phenomena: a simple surface, such as the sphere formed by a liquid drop in the absence of gravity; how a drop reacts to different forces (drop dynamics); and how surfaces and compound drops - a drop of one liquid surrounding a drop of a different liquid - interact.
Payload on STS-50, Spacelab/USML-1

The second United States Microgravity Laboratory (USML-2) Spacelab mission was the prime payload on STS-73. The 16-day flight continued a cooperative effort of the U.S. government, universities and industry to push back the frontiers of science and technology in "microgravity", the near-weightless environment of space.
Some of the experiments carried on the USML-2 payload were suggested by the results of the first USML mission that flew aboard Columbia in 1992 during STS-50. The USML-1 mission provided new insights into theoretical models of fluid physics, the role of gravity in combustion and flame spreading, and how gravity affects the formation of semiconductor crystals. Data collected from several protein crystals grown on USML-1 enabled scientists to determine the molecular structures of those proteins.
USML-2 Built on that foundation. Technical knowledge gained was incorporated into the mission plan to enhance procedures and operations. Where possible, experiment teams refined their hardware to increase scientific understanding of basic physical processes on Earth and in space, as well as to prepare for more advanced operations aboard the International Space Station and other future space programs.

 
The second United States Microgravity Laboratory (USML-2) Spacelab mission was the prime payload on STS-73. The 16-day flight continued a cooperative effort of the U.S. government, universities and industry to push back the frontiers of science and technology in "microgravity", the near-weightless environment of space.
Some of the experiments carried on the USML-2 payload were suggested by the results of the first USML mission that flew aboard Columbia in 1992 during STS-50. The USML-1 mission provided new insights into theoretical models of fluid physics, the role of gravity in combustion and flame spreading, and how gravity affects the formation of semiconductor crystals. Data collected from several protein crystals grown on USML-1 enabled scientists to determine the molecular structures of those proteins.

Payload on STS-50 and STS-73 on board USML-1 (U.S. Microgravity Laboratory) and USML-2 respectively.

The Drop Physics Module has been developed so scientists can study several fluid
physics phenomena: a simple surface, such as the sphere formed by a liquid drop in
the absence of gravity; how a drop reacts to different forces (drop dynamics); and
how surfaces and compound drops - a drop of one liquid surrounding a drop of a
different liquid - interact.

Payload on STS-73, USML-2 (DPM-2)
Payload on STS-50, Spacelab